505335665 has 4 divisors (see below), whose sum is σ = 606402804. Its totient is φ = 404268528.

The previous prime is 505335653. The next prime is 505335689. The reversal of 505335665 is 566533505.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101767744 + 403567921 = 10088^2 + 20089^2 .

It is a cyclic number.

It is not a de Polignac number, because 505335665 - 2⁸ = 505335409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50533562 + ... + 50533571.

It is an arithmetic number, because the mean of its divisors is an integer number (151600701).

Almost surely, 2^505335665 is an apocalyptic number.

It is an amenable number.

505335665 is a deficient number, since it is larger than the sum of its proper divisors (101067139).

505335665 is a wasteful number, since it uses less digits than its factorization.

505335665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101067138.

The product of its (nonzero) digits is 202500, while the sum is 38.

The square root of 505335665 is about 22479.6722618458. The cubic root of 505335665 is about 796.5138224624.

The spelling of 505335665 in words is "five hundred five million, three hundred thirty-five thousand, six hundred sixty-five".